python - Mapper Mapper|用户|用户无法组装映射表的任何主键列 'users'

Question

from sqlalchemy import *
from sqlalchemy import create_engine, ForeignKey
from sqlalchemy import Column, Date, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship, backref

engine = create_engine('sqlite:///database.db', echo=True)
Base = declarative_base()

########################################################################
class User(Base):
    """"""
    __tablename__ = "users"

id = Column(Integer, primary_key=True)
username = Column(String)
password = Column(String)

#----------------------------------------------------------------------
def __init__(self, username, password):
    """"""
    self.username = username
    self.password = password

# create tables
Base.metadata.create_all(engine)

这应该创建一个文件名为database.db的数据库结构，但是弹出错误，我该如何解决它？任何帮助将不胜感激。

Answer 1

这是一个缩进问题。解决了。解决方案:

from sqlalchemy import *
from sqlalchemy import create_engine, ForeignKey
from sqlalchemy import Column, Date, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship, backref

engine = create_engine('sqlite:///tutorial.db', echo=True)
Base = declarative_base()

########################################################################
class User(Base):
    """"""
    __tablename__ = "users"

    id = Column(Integer, primary_key=True)
    username = Column(String)
    password = Column(String)

#----------------------------------------------------------------------
def __init__(self, username, password):
    """"""
    self.username = username
    self.password = password

# create tables
Base.metadata.create_all(engine)